Finding the Fourth Proportional to 134.69, 185.78 and 123.89

Step by Step Solution

1. Step 1: Write the proportion equation
   134.69 : 185.78 = 123.89 : x
2. Step 2: Convert to fraction form
   134.69/185.78 = 123.89/x
3. Step 3: Cross multiply
   134.69x = 185.78 × 123.89
4. Step 4: Simplify right side
   134.69x = 23,015.66
5. Step 5: Solve for x
   x = 23,015.66/134.69
6. Step 6: Final answer
   x = 170.88